Entrance to Plutonium

View looking southeast at the excavations of the "New Plutonium."  Note the doorway on the lower left, and the reflections on the water partially visible in the center of the image.  There are five long benches to the left of the water.  There, people could sit and watch rites associated with the Plutonium.

This picture was taken a few years before the Plutonium was reconstructed.

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In March 2013, Francesco D'Andria, professor of classic archaeology at the University of Salento and excavator at Hierapolis announced that he had excavated the well–known, to ancient authors, Plutonium at Hierapolis—known as the gate to the Underworld.

There is a very useful article in "seeker.com" that describes the discovery in detail.